Adjustable chair



Patented Dec. 13, 1887.

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E. PYNOHON.

ADJUSTABLE CHAIR. No. 37 4,628. Patented 1300 13, 1887.

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' ADJUSTABLE CHAIR.

Patented Dec. 13, 1887.

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ADJUSTABLE CHAIR.

No. 374,628. Patented Dec. 13,1887.

5 Sheets-Sheet 5.

(No Model.)

BPYNGHON. ADJUSTABLE CHAIR.

I gall-hig 'Patented Dec. 13,- 1887.

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UNITED STATES PATENT Orrrcn.

EDWIN PYNcHoN, or CHICAGO, ILLINOIS- ADJUSTABLE CHAIR.

SPECIFICATION forming part of Letters Patent No. 374,628, dated December 13, 1887.

Application filed October 14, 1886. Serial No. 216,283. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWIN PYNcHoN, a citizen of the United States, residing at Chicago,

be capable of extreme tilting in either direc-- tion, which shall have an extensible, folding, and adjustably-inclining footrest, and which shall have a removable, adjustable, and reversible limb-rest. These objects I attain by the mechanism illustrated in the accompanying drawings, wherein-- Figure-l is a perspective view of my chair with rear parts removed. Fig. 2 is a rear elevation with part removed to show the spiral spring. Fig. 3 is a section through the line X X. Fig. 4. is a section through the line Y Y. Fig. 5 is a side elevation. Fig. 6 is a section through the line Z Z. Fig.7 is a side elevation. Fig. 8 is a side View of the body of the chair folded. Fig. 9 is a detail view of the leg-rest folded.- Fig. 10 is a diagram of the hangerframe. Fig. 11 is a plan view of the seat-elevating frame and seat-frame-locking mechanism, the seat itself being removed. Fig. 12 is an under view of the back tilting and locking mechanism.

A A are the curved side pieces which form the legs of the frame, having the lateral supports A A, connected by the cross-bars A A A A and A A are diagonal cross-bars which strengthen and complete the frame. On each lower lateral support is a projection, B, with a short horizontal slot, B, and a vertical slot, B On the upper lateral support is a similar projection, B, having the hole B.

At the top of each curved piece is. the arm B The upper part of each curved side piece is straight, as illustrated by A, and pivoted thereon are three hangers, O O O, by the pivots G O O, and in like manner pivoted at their lower ends to the bar 0*. The lengths of the hangers and the distances between the extreme pivots on the side pieces and the bar 0 are such that when the bar 0 is swung as far as possible in both directions the result is, that the parts successively form equal isosceles triangles. This is more clearlyillustrated in the diagram.

' The tilting frame is composed of the bars G 0 the cross-bars D D, the strengthening-bars D D, the pivoted bars D D and the crossbar D The bars D D and O G are pivoted together by the rod D. The seat-elevating frame is composed of the rods D D* and the cross-pieces D D and D D, and it is pivoted below on the cross-rod D to the rear ends of the bars 0 O" and provided above with a long keeper, D which receives the rods D D, secured along the bottom of the seat. Spiral springs D bear against the cross-bars of this frame and tend to elevate it, while a depend ing handle thereon, D, may be used to counteract the spring and lower the'frame.

E is the seat, made, as desired, of crossbars E E and secured rigidly to the bars D D and D. On the rear of the barsD 'D are lugs F F, to which the back F is pivoted, and also locking-apertures F F. The back F is composed, as desired; but at its lower sides and concentricl with its pivots are circumferentially-perforated segments F*, whose perforations are lettered F On the back of the bar D is a handle, D, and an aperture, D and on the front of the same are bearings G G for the laterally-reciprocatiug rods G G. These rods are forced outwardly by the spiral springs G". G; but they may be retracted by the lever G These rods, by entering the apertures F F and F F, serve to lock the back in any position.

H H are pieces, shaped as shown, secured to the bars (3 O", perforated at H H, and carrying at their forward ends the cross-rods J and J.

H 1-1 are laterally-reciprocating rods sliding in the bearings H H and forced outward by the spiral springs H H*, and securedat their inner ends to the elbow-levers H H H is a cross-bar with foot-pieces H H7. Its ends project through the slots B B'. It has at its center upwardly-extending rods H H", which engage the free ends of the elbow-levers H H By bearing down on either of the footpieces the rods H H will be retracted, and

oted to the foot-piece and the rods J J and notched to engage the pins J, one of such pins being on each side of the foot-piece.

J-J are hangers, pivoted to the side bars of the limb-support, and curved at their lower ends and pivoted to the bars J 9 J Thelatte'r are pivoted on the rod J. Pivoted to the bars J J is a frame composed of the curved bars J J and the cross-pieces J J. The bars J J" are provided with notches which-engage the rod J and serve to hold the limb-support in any desired position. On the side bars 0f the limb-support are the lugs K K, with eyes to receive the leg-rest.

KK' are parallel bars pivoted tothe'crossbars K and K, the latter having pivoted atits outer end the extensible triangular frame composed of the side bars K K connected by the jointed bar K and provided'each'with the leg-receiver K K. The outer bar K also has the foot-receiver K at itslower end. The outer bar K is notched on its outeredge to engage the hooked end of the pivoted hanger K".

The use and operation of my invention are as follows: The back can be freed from its locking device and turned over so as to fold upon the seat, or it can be locked at any desired angle. This is done by manipulating the lever G, which can be used to retract the locking-rods G G from the apertures F in the side bars D". When the lever is released, the spiral springs G Gthrowthe rods out into said apertures and the back is locked. The'chair may be easily tilted in eitherdirection by the use of the lever H. When the foot bears down on one end of this lever,presstire is applied to the bell-crank levers H H and the locking-rods H H are retractedfrom the apertures B B, and the tilting framecan be swung. If the end of the'lever-be'carried into the slot B,the body of the chair is free to tilt. The limb-support is pivoted to the chair proper by the rod D and can be held atany angle by locking the curved bars J J on the rod J. The foot-piece J canbe turned down, as in Fig. 7, in which position it is securely held by the bars J and lever J, and also by reason of its edge engaging the lower edgeof thelimb-support; The leg-support can be At the lower ends of these side bars is pivoted the footpiece J,' which is supported by the jointed rods J J and the third-class levers J 6 J which are.piv-- the two :leg-rceivers K K can'be used. When these parts are turned down, the footreceiver K is in position for use. To elevate the seat, the tilting frame is first freed and swung forward, as. shown in Fig. 7, and there ,locked. The seat is then raised by means of the handle 1)", and the seat-elevating frame,

being freed from the weight of the seat, immediately rises under the influence of the spiral springs D D and holds the seat up. The keeper D slides along the rods D D". To fold the chair-body into the'shape shown infFig. 8, the foot-piece J is folded up onto the limbsupport. -The limb-support is then folded up onto the seat, as shown. The back is now unlocked and folded forward onto the limb-support. The seat is then lowered. The

diagram shows the arcs deseribed by the several hangers as the chair is tilted.

I'herein disclaim all matter shown in this application, and also shown and claimed in my application Serial No. 203,468, referring particularly to the hangers whereby the seatframe issuspended and the-lock-bars whereby it is locked in position.

"I claim- 1. In an adjustablechair, the combination of 'a limb-support curved and pivoted at its innerend'to the seat-frame, bars pivoted to :gether and respectively to the chair-frame and the limb-support, the latter bars being curved, as shown, a ratchet-bar pivoted to one of the pivot-bars, and a catch to engage said ratchet, whereby the support may be held at various angles and folded over ontothe seat.

2. 'In an adjustable chair,a limbsupport, in combination with a pivoted foot-piece having an adj ustable support on each side,consisting of three bars, one pivoted to said foot-piece, theothers'pivoted together and respectively at theiro'ther ends to the limb-support and to the middle of the first bar, and apin on the foot-piece and a notch on the bar having a free end to engage said pin,whereby the footpiece may besupported by said bars either at right anglesto or parallel with the limb-supahandle whereby said spring elevating-frame may belowered when it is desired to lower theseat.

5. In an adjustable chair, a leg support consisting of pivoted bars secured to the supporting-bars below, connected above by a jointed bar, and provided each witha leg-receiver above.

6. In an adjustable chair, a leg-supportconsisting of two bars pivoted together at their lower ends and secured upon a suitable support, connected above by a jointed bar, and provided each with a leg-receiver and one with a foot-receiver.

7. In an adjustable chair, the combination of a stirrup, a support therefor, which consists of a quadrilateral frame of pivoted bars secured at one side upon the chair, one of said bars being provided with notches, in combination with a rod pivoted at one angle of the quadrilateral and provided with a hook at its other end to engage the notches, with a legsupport secured upon said quadrilateral frame.

8. In an adjustable chair, the combination of a supporting-frame, a tilting frame thereon, 1

a seat-frame pivoted to the front of said tilting frame, and an elevating-frame secured to the rear of the tilting frame and adapted to rise and support the seat when the same is raised.

.In testimony whereof I have hereunto set my hand, this 9th day of October, A. D. 1886, at Chicago, Illinois, in the presence of two witnesses.

EDWIN PYNOHON.

Witnesses:

FRANCIS W. PARKER, G, G. J AOKSON. 

